In my opinion, the best songs of Madonna's career came when she collaborated with both Stephen Bray and Pat Leonard.

Pat Leonard for me particularly is a musical genius up there with the best of them and here in 2008 he played two of the most amazing songs he wrote with Madonna (and two of the best pop songs of all time) as piano solos. The 1986 masterpieces "Live To Tell" and "La Isla Bonita".